Sahih Muslim , Book 4, Hadith 257 (In-Book) ⓘ

Ibn 'Abbas reported: The Apostle of Allah had been commanded that he should prostrate on the seven (bones) and he was forbidden to fold back the hair and clothing. And in the narration transmitted by Abu Rabi' (the words are):" on the seven bones and I was forbidden to fold back the hair and clothing". According to Abu'l-Rabi' (the seven bones are): The hands, the knees, and the (extremities) of the feet and the forehead.

وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، وَأَبُو الرَّبِيعِ الزَّهْرَانِيُّ، قَالَ يَحْيَى أَخْبَرَنَا وَقَالَ أَبُو الرَّبِيعِ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ عَمْرِو بْنِ دِينَارٍ، عَنْ طَاوُسٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ أُمِرَ النَّبِيُّ صلى الله عليه وسلم أَنْ يَسْجُدَ عَلَى سَبْعَةٍ وَنُهِيَ أَنْ يَكُفَّ شَعْرَهُ وَثِيَابَهُ ‏.‏ هَذَا حَدِيثُ يَحْيَى ‏.‏ وَقَالَ أَبُو الرَّبِيعِ عَلَى سَبْعَةِ أَعْظُمٍ وَنُهِيَ أَنْ يَكُفَّ شَعْرَهُ وَثِيَابَهُ الْكَفَّيْنِ وَالرُّكْبَتَيْنِ وَالْقَدَمَيْنِ وَالْجَبْهَةِ ‏.‏